How many version doesn TDK veloCD 40X12X48" " have?

[Twinhead]

I know older model has at least 3 different version from different manufacturer. I've seen 40X12X48 and 40X12X48B and I think latter is manufactured by Lite-On.
Anyone has seen other version? Which version is better?

 

[gonzo2k]

I have 40x12x48x Pretty sure it's a Sanyo drive. I'm happy with it.